Determine throat diameter with a chamber cast- either with Cerrosafe (follow directions religiously), or via a pound cast with a soft lead slug. Size the bullet to .0005" under throat diameter regardless of what the groove diameter is. Inside diameter of sized cartridge case sized accordingly so as not to alter bullet diameter when seating.
A trick I use to mate top punches to bullet noses is to put a dab of thickened epoxy in the punch and drop it onto the bullet while partially sticking out of the sizing die. (Don't forget the release agent on the nose of the bullet!) Wipe off any squeeze out and let sit until epoxy hardens. Presto, a custom top punch. I turn my own top punches on my lathe, and since I don't want to be so anal as to machine a perfect cavity to match a particular bullet nose, I simply hog them out oversize and then do the epoxy trick.
Last edited by gnoahhh; 01/27/15.
"You can lead a man to logic, but you cannot make him think." Joe Harz "Always certain, often right." Keith McCafferty
